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It would be best to ask Cobb this, contact their support dudes via phone or email.
But anyway, here's my $0.02.
The Cobb Stage 2 is the stock ebc with new vacuum lines to allow the higher boost. If you don't have vacuum lines, contact Cobb and they will send you some. They did for me and many others.
The full list of mods for Cobb Stage 2 is:
- stock air box with drop-in Cobb filter or paper filter ONLY (no HKS foam, boo, mine is on the shelf)
- Cobb vacuum lines on the stock EBC
- full 3" turboback exhaust with high-flow 3"in/out cat, or test pipe
Perrin replaces the stock ebc with their ebc. I am guessing that the Perrin maps are on that AP. Uninstalling the AP doesn't remove maps in it, just removes the map from the ECU and returns it to stock.
Btw if your sig is accurate you're beyond the Cobb and Perrin off-the-shelf maps slightly due to your Apexi o2 housing. I honestly have no idea how severe of a deviation it is, if it's a big deal or not. But technically, you're in the area of 'custom tune required'.
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